Decree of PainSorcery
Destroy all creatures. They can't be regenerated. Draw a card for each creature destroyed this way.Cycling (, Discard this card: Draw a card.)When you cycle Decree of Pain, all creatures get -2/-2 until end of turn.

DuplicantArtifact Creature
— Shapeshifter (2/4) Imprint — When Duplicant enters the battlefield, you may exile target nontoken creature.As long as a card exiled with Duplicant is a creature card, Duplicant has the power, toughness, and creature types of the last creature card exiled with Duplicant. It's still a Shapeshifter.

Kaalia of the VastLegendary Creature
— Human Cleric (2/2) FlyingWhenever Kaalia of the Vast attacks an opponent, you may put an Angel, Demon, or Dragon creature card from your hand onto the battlefield tapped and attacking that opponent.

Maelstrom WandererLegendary Creature
— Elemental (7/5) Creatures you control have haste.Cascade, cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order. Then do it again.)

Scroll RackArtifact
, : Exile any number of cards from your hand face down. Put that many cards from the top of your library into your hand. Then look at the exiled cards and put them on top of your library in any order.

Sylvan LibraryEnchantment
At the beginning of your draw step, you may draw two additional cards. If you do, choose two cards in your hand drawn this turn. For each of those cards, pay 4 life or put the card on top of your library.

The MimeoplasmLegendary Creature
— Ooze (0/0) As The Mimeoplasm enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card.

Vela the Night-CladLegendary Creature
— Human Wizard (4/4) Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)Other creatures you control have intimidate.Whenever Vela the Night-Clad or another creature you control leaves the battlefield, each opponent loses 1 life.